<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/04/04/130404100446_blogs_304x171_reuters.jpg>
<http://www.bbc.com/mundo/noticias/2013/04/130403_tecnologia_compra_blogs_segunda_mano_jrg.shtml>